I think it's worth noting that MV3 also solves problems. Like, the fact that an extension can do arbitrary things is obviously very dangerous. The ability to in

I think it's worth noting that MV3 also solves problems. Like, the fact that an extension can do arbitrary things is obviously very dangerous. The ability to intercept arbitrary API calls and scripts is very powerful. So the goal is to remove that power, so that it can not be abused. Then the question is "and how do we solve the legitimate use cases?" - hence the years of working with people like Gorhill to help build a better API to serve the ad blocking use case. MV3 was delayed because, despite the numerous changes made to MV3 to satisfy these use cases, it's clear that there needs to be more work to do so.